I've worked on some scramjet projects as a controls engineer (so I'm not a propulsion engineer) but that experience taught me how ridiculously difficult it is to maintain supersonic combustion. It may be that this guy has single handedly done what nations like the USA are struggling with but I would remain skeptical unless I see some details - any details whatsoever. Furthermore, the picture that we see, looks like a flameout - not even a rocket engine.
View attachment 955211
The exhaust plume doesn't even look supersonic (no shock diamonds), which it is even for rocket engines.
This is what a firing scramjet looks like:
View attachment 955209
The picture in the news articles doesn't even look like a successful rocket engine, let alone scramjet.
So I am going to remain skeptical.
EDIT: Also a SCRAMjet by definition requires supersonic flow through it, which usually requires a very special supersonic wind tunnel to even start a SCRAMjet. I see no such wind tunnel here, obviously.